If you're going to use the center AF point only...

I've seen several reviews of the 6D in which they talk about using only the center AF point. First off, just how bad are the outer points? And second of all, who uses JUST the center AF point? Do many people ignore basic guidelines of photography (ie, rule of thirds) for the majority of their shots?

IMO, I'd like to have highly sensitive AF points in the middle and at the 4 junctions of the rule of thirds and then a small array of other points that don't necessarily have to be quite as sensitive (if we're talking about a budget conscious camera, anyway). Am I the only one thinking like this?